Jenkins up to 2.121.1/2.132 User.java access control

Summaryinfo

A vulnerability marked as critical has been reported in Jenkins up to 2.121.1/2.132. Impacted is an unknown function of the file User.java. The manipulation leads to access control. This vulnerability is referenced as CVE-2018-1999001. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Jenkins up to 2.121.1/2.132 (Continuous Integration Software). This issue affects an unknown code of the file User.java. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A unauthorized modification of configuration vulnerability exists in Jenkins 2.132 and earlier, 2.121.1 and earlier in User.java that allows attackers to provide crafted login credentials that cause Jenkins to move the config.xml file from the Jenkins home directory. If Jenkins is started without this file present, it will revert to the legacy defaults of granting administrator access to anonymous users.

The bug was discovered 07/18/2018. The weakness was published 07/23/2018 (Website). The advisory is shared at jenkins.io. The identification of this vulnerability is CVE-2018-1999001 since 07/23/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 111176 (FreeBSD : jenkins -- multiple vulnerabilities (20a1881e-8a9e-11e8-bddf-d017c2ca229d)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 13217 (Jenkins Arbitrary File Access Vulnerability).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111176). Similar entries are available at VDB-122106, VDB-122107, VDB-122108 and VDB-122109. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Continuous Integration Software

Name

• Jenkins

Version

• 2.121.0
• 2.121.1
• 2.132

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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